A method for preparing a multi-stage fracture component

Abstract

The present invention relates to a method for preparing a multi-stage fracture component. The multi-stage fracture component comprises a core rope and a sheath, wherein the sheath is coated on the outside of the core rope, the sheath is braided and fixed with the core rope by connecting the strands, the core rope comprises a plurality of core rope strands, the sheath comprises a plurality of outer sheath strands, and the sheath is a pleated tube sheath structure woven from a plurality of outer sheath strands. The steps for preparing the multi-stage fracture component are as follows: braiding the core rope; pre-weaving the rope yarn into sheath strands by a strand making machine; stretching the core rope by a stretching machine so that the tension of the core rope is 10-15% of the breaking force of the core rope, and braiding a plurality of sheath strands around the core rope at one time by a double braiding machine on the outside of the core rope; fixing the two ends of the braided core rope and the sheath, and placing them in an oven for shrinking and shaping, the heat shrinking time is 8-10 hours, the temperature is 70-75°C, and after shaping is completed, the sheath will shrink into a pleated sleeve structure. The present invention reduces the rebound force after the cable breaks, and achieves the effect of anti-rebound and safe use.

Description

Technical Field

[0001] The invention belongs to the technical field of cables, and in particular relates to a method for preparing a multi-stage fracture component. Background Art

[0002] Mooring at the dock is one of the most important and dangerous tasks in ship operations. Every year, many crew members and dock workers are injured due to improper cable handling, or even when the cable breaks suddenly while in use, causing serious safety accidents. However, there is a risk of rebound when the mooring cable breaks. While minimizing the breakage of the cable as much as possible, attention should be paid to the injuries caused by rebound after the cable breaks accidentally.

[0003] The Chinese invention patent application with publication number CN106757755A discloses a buffer protection rope with graded fracture and its preparation process and the Chinese utility model patent application with authorization announcement number CN 207468952 U discloses an anti-rebound rope. Both describe a design to reduce the risk of cable rebound. The former is to mix and weave high-elongation and low-elongation rope strands. When the cable is stretched by external force, only a few low-elongation rope strands will break at first, and the remaining high-elongation rope strands will not break immediately. This structural design not only partially sacrifices the strength of the cable, but also exposes the high elasticity directly to the outside. In actual use, this structure is easily damaged and has poor fatigue resistance. When the latter is to divide the rope strands into an inner core and a sheath, the break rebound of the cable is reduced by the difference in elongation between the inner core and the sheath. This design can reduce the risk of break rebound of the cable to a certain extent. However, this design is the same as that recorded in the Chinese invention patent application with publication number CN106757755A. The high elastic fiber is directly exposed to the outside, which is easy to cause wear. Both types of cables can only reduce rebound once. When the ship continues to move, it is still possible to continue to rebound. The effect of reducing the rebound caused by cable breakage is very limited. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a method for preparing a multi-stage breaking component. When the multi-stage breaking component is broken by external force, it will show multi-stage breaking effect, resulting in an intermittent breaking effect, thereby reducing the rebound force after the cable breaks, achieving the effect of anti-rebound and safe use.

[0005] A technical solution of a multi-stage fracture assembly of the present invention is:

[0006] A multi-stage breaking component comprises a core rope and a sheath, wherein the sheath is covered on the outside of the core rope and is braided and fixed to the core rope by connecting rope strands. The core rope comprises a plurality of core rope strands, and the sheath comprises a plurality of outer shell rope strands. The sheath is in a pleated tube sheath structure braided from a plurality of outer shell rope strands.

[0007] As a further improvement to the above technical solution, the elongation of the core rope strands is less than the elongation of the connecting rope strands, and the elongation of the connecting rope strands is equal to the elongation of the sheath rope strands.

[0008] As a further improvement of the above technical solution, the core rope strands are 3 strands or 12 strands, and the sheath rope strands are 24 strands, 32 strands or 48 strands; the core rope strands are made of polyamide fiber or polypropylene filament, and the elongation at break is 18-20%; the sheath rope strands and the connecting rope are ultra-high molecular weight polyethylene fiber or aramid fiber, and the elongation at break is 3-4%; the fiber line density of the core rope strands is 1870dtex-3330dtex, and the fiber line density of the sheath rope strands and the connecting rope is 1760dtex.

[0009] The technical solution of the multi-stage fracture assembly preparation method of the present invention is:

[0010] A method for preparing a multi-stage fracture component comprises the following steps:

[0011] The core rope is braided by a braiding machine;

[0012] A plurality of ultra-high molecular weight polyethylene fibers are twisted into rope yarns through a twisting machine, and the twisted rope yarns are pre-woven into sheathed rope strands that meet the size of the double-layer rope braiding machine spindle through a strand making machine;

[0013] The core rope is stretched by a stretching machine to make the tension of the core rope 10-15% of the breaking force of the core rope, and a plurality of sheath rope strands are braided around the core rope at one time on the outside of the core rope by a double braiding machine;

[0014] Fix the two ends of the braided core rope and the sheath, and place them in an oven for shrinkage and shaping. The heat shrinkage time is 8-10 hours at a temperature of 70-75°C. After shaping, the sheath will shrink into a pleated sleeve structure.

[0015] A technical solution of a cable of the present invention is:

[0016] A cable comprises a rope body, wherein a tubular structure gap is provided in the rope body and extends along the length direction of the rope body and passes through both ends of the rope body, and the multi-stage breaking component described in the above technical solution is installed in the tubular structure gap.

[0017] As a further improvement of the above technical solution, the core rope diameter of the multi-stage fracture assembly matched with the rope body with a diameter of 16-36mm is 6mm, the core rope diameter of the multi-stage fracture assembly matched with the rope body with a diameter of 38-56mm is 12mm, and the core rope diameter of the multi-stage fracture assembly matched with the rope body with a diameter of 56-80mm is 16mm.

[0018] The present invention provides a method for preparing a multi-stage fracture assembly. Compared with the prior art, the method has the following beneficial effects:

[0019] When the cable of the present invention is used, after the cable is stressed, the rope body is stressed first. When the rope body is stretched to the maximum, the rope body breaks first, completing the first break of the cable. The multi-stage break component will absorb part of the energy released by the rope body break, and will not rebound immediately. Continue to stretch, the multi-stage break component begins to be stressed, and the sheath of the pleated suit structure outside the component begins to be stretched. When the maximum elongation is reached, the sheath begins to break, and the second break of the cable is completed at this time. Rebound will not occur immediately, and the core rope of the multi-stage break component will absorb part of the energy released by the sheath, and will not rebound immediately. Continue to stretch, when the elongation of the core rope reaches the maximum, the core rope will also break completely, and the third break of the cable has been completed. At this time, the released energy has been effectively reduced, and basically no large rebound will occur.

[0020] The multi-stage breaking component of the present invention is a low-elongation cable accessory, which can be woven into the cable as an inner core. When the low-elongation cable breaks, the multi-stage breaking component can absorb the energy released by the break, and the multi-stage breaking component alone can break at least twice, which greatly reduces the risk of cable breakage and rebound, and the time difference between the first and third breaks is relatively long. Compared with traditional anti-rebound cables that break at most twice, the cable is safer and more reliable to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the structure of the cable of the present invention;

[0022] Figure 2 is a flow chart of the method for preparing a multi-stage fracture assembly of the present invention;

[0023] Figure 3 It is a diagram showing the relationship between the tensile displacement and the force during the stretching process of the cable during the cable breaking test of the present invention;

[0024] In the figure: 1. rope body; 2. sheath; 3. core rope. DETAILED DESCRIPTION

[0025] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments:

[0026] A specific embodiment of the multi-stage fracture assembly of the present invention is as follows Figure 1 As shown, it includes a core rope and a sheath, the sheath is covered on the outside of the core rope, the sheath is braided and fixed to the core rope by connecting the rope strands, the core rope includes multiple core rope strands, the sheath includes multiple outer shell rope strands, and the sheath is a pleated tube sheath structure woven from multiple outer shell rope strands.

[0027] In this embodiment, the elongation of the core rope strands is less than the elongation of the connecting rope strands, and the elongation of the connecting rope strands is equal to the elongation of the sheath rope strands. The core rope strands are 3 strands or 12 strands, and the sheath rope strands are 24 strands, 32 strands or 48 strands; the core rope strands are made of polyamide fiber or polypropylene filament, and the elongation at break is 18-20%; the sheath rope strands and the connecting rope are ultra-high molecular weight polyethylene fiber or aramid fiber, and the elongation at break is 3-4%; the fiber line density of the core rope strands is 1870dtex-3330dtex, and the fiber line density of the sheath rope strands and the connecting rope is 1760dtex.

[0028] A specific embodiment of the method for preparing a multi-stage fracture assembly of the present invention is as follows: Figure 2 As shown, the following steps are included:

[0029] The core rope is braided by a braiding machine;

[0030] A plurality of ultra-high molecular weight polyethylene fibers are twisted into rope yarns through a twisting machine, and the twisted rope yarns are pre-woven into sheathed rope strands that meet the size of the double-layer rope braiding machine spindle through a strand making machine;

[0031] The core rope is stretched by a stretching machine to make the tension of the core rope 10-15% of the breaking force of the core rope, and a plurality of sheath rope strands are braided around the core rope at one time on the outside of the core rope by a double braiding machine;

[0032] Fix the two ends of the braided core rope and the sheath, and place them in an oven for shrinkage and shaping. The heat shrinkage time is 8-10 hours at a temperature of 70-75°C. After shaping, the sheath will shrink into a pleated sleeve structure.

[0033] A specific embodiment of the cable of the present invention is as follows: Figure 1 As shown, it includes a rope body, in which a tubular structure gap extending along the length direction of the rope body and passing through both ends of the rope body is provided, and the multi-stage fracture component described in the above technical solution is installed in the tubular structure gap.

[0034] In this embodiment, the multi-stage fracture component includes a core rope and a sheath. The sheath is covered on the outside of the core rope. The sheath is braided and fixed to the core rope by connecting the rope strands. The core rope includes multiple core rope strands, and the sheath includes multiple outer rope strands. The sheath is a pleated tube structure woven from multiple outer rope strands.

[0035] In this embodiment, the elongation of the core rope strands is less than the elongation of the connecting rope strands, and the elongation of the connecting rope strands is equal to the elongation of the sheath rope strands. The core rope strands are 3 strands or 12 strands, and the sheath rope strands are 24 strands, 32 strands or 48 strands; the core rope strands are made of polyamide fiber or polypropylene filament, and the elongation at break is 18-20%; the sheath rope strands and the connecting rope are ultra-high molecular weight polyethylene fiber or aramid fiber, and the elongation at break is 3-4%; the fiber line density of the core rope strands is 1870dtex-3330dtex, and the fiber line density of the sheath rope strands and the connecting rope is 1760dtex.

[0036] In this embodiment, the core rope diameter of the multi-stage breaking assembly matched with the rope body with a diameter of 16-36 mm is 6 mm, the core rope diameter of the multi-stage breaking assembly matched with the rope body with a diameter of 38-56 mm is 12 mm, and the core rope diameter of the multi-stage breaking assembly matched with the rope body with a diameter of 56-80 mm is 16 mm.

[0037] When the cable of the present invention is used, after the cable is stressed, the rope body is stressed first. When the rope body is stretched to the maximum, the rope body breaks first, completing the first break of the cable. The multi-stage break component will absorb part of the energy released by the rope body break, and will not rebound immediately. Continue to stretch, the multi-stage break component begins to be stressed, and the sheath of the pleated suit structure outside the component begins to be stretched. When the maximum elongation is reached, the sheath begins to break, and the second break of the cable is completed at this time. Rebound will not occur immediately, and the core rope of the multi-stage break component will absorb part of the energy released by the sheath, and will not rebound immediately. Continue to stretch, when the elongation of the core rope reaches the maximum, the core rope will also break completely, and the third break of the cable has been completed. At this time, the released energy has been effectively reduced, and basically no large rebound will occur.

[0038] The multi-stage breaking component of the present invention is a low-elongation cable accessory, which can be woven into the cable as an inner core. When the low-elongation cable breaks, the multi-stage breaking component can absorb the energy released by the break, and the multi-stage breaking component alone can break at least twice, which greatly reduces the risk of cable breakage and rebound, and the time difference between the first and third breaks is relatively long. Compared with traditional anti-rebound cables that break at most twice, the cable is safer and more reliable to use.

[0039] In the second specific embodiment of the cable of the present invention, a 300T multifunctional testing machine is used to perform a breaking test on the cable. The diameter of the cable body in the test is 26mm, the diameter of the core rope in the multi-stage breaking assembly is 6mm, and the 300T multifunctional testing machine stretches the cable at a speed of 250mm / min. The test results are as follows: Figure 3As shown, the cable broke three times from the beginning of elongation to the breaking process. Specifically, the tension on the cable was 559.13KN when the cable broke for the first time, 110.89KN when the cable broke for the second time, and 9.89KN when the cable broke for the third time. It can be seen from the test results that the cable of the present invention breaks in multiple stages when it is pulled up by external force, which can produce a staccato breaking effect, reduce the rebound force after the cable breaks, and achieve the effect of anti-rebound and safe use.

[0040] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for preparing a multi-stage fracture component, characterized in that: The following steps are involved: The core rope is braided by a braiding machine; Several ultra-high molecular weight polyethylene fibers are twisted into rope yarns through a twisting machine. Pre-woven into sheath strands that meet the size of the double-layer braiding machine spindle by a strand making machine; The core rope is stretched by a stretching machine so that the tension of the core rope is 10-15% of the breaking force of the core rope. The rope strands are braided around the core rope at one time on the outside of the core rope by a double braiding machine; Fix the two ends of the braided core rope and the sheath, place them in an oven for shrinking and shaping, and heat shrinking time The temperature is 70-75℃ for 8-10h. After the shaping is completed, the sheath will shrink into a pleated sleeve structure.

2. The method for preparing a multi-stage fracture assembly according to claim 1, characterized in that: Pleated sleeve knot The shrinkage rate of the structural sheath is at least 40%-80%.

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